<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>倒计时系统</title>
    <style>
        /* 给盒子一个样式 */
        .div1{
            width: 200px;
            height: 200px;
            background: rgba(128, 128, 128, 0.3);
            margin: 0 auto;
            border-radius: 50%;
            position: relative;
            top: 300px;
            text-align: center;
        }
        /* 控制秒数样式 */
        .number{
            font-size:100px;
            display: block;
            position: relative;
            top: 10px;
            font-weight: 900;
        }
        /* 跳转字体 */
        .skip{
            font-size: 14px;
            margin-top: 10px;
        }
        b{
            color:red;
            font-weight: 900;
        }

        ol {
            padding: 10px;
            list-style: none;
            counter-reset: sectioncounter
        }
        ol li {
            margin: 10px;

        }
        ol > li:before {
            content: '效果' counter(sectioncounter) ':';
            counter-increment: sectioncounter;
            font-size: 18px;
            color: #d4d4d4;
        }
        ol > li:nth-of-type(odd) {
            background-color: #f9f9f9;
        }
    </style>
</head>
<body>
    <div class="div">
        <ol type="a">
            <li><a href="项目倒计时">项目倒计时</a></li>
            <li><a href="钟表倒计时">钟表倒计时</a></li>
            <li><a href="跳转倒计时">跳转倒计时</a></li>
            <li><a href="光子倒计时">光子倒计时</a></li>
            <li><a href="LED 倒计时">LED 倒计时</a></li>
            <li><a href="粒子倒计时">粒子倒计时</a></li>
            <li><a href="秒杀倒计时">秒杀倒计时</a></li>
            <li><a href="日期倒计时">日期倒计时</a></li>
            <li><a href="输入倒计时">输入倒计时</a></li>
            <li><a href="演示倒计时">演示倒计时</a></li>
            <li><a href="考试倒计时">考试倒计时</a></li>
            <li><a href="特效倒计时">特效倒计时</a></li>
        </ol>
    </div>
</body>

</html>
